Abstract: In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil, the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse, (355 nm+1064 nm) and (1064 nm+355 nm) collinear dual-pulses were studied. The results show that, compared to a single 1064 nm pulse, maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses. The results provide a reference for the detection of heavy metals in soil.